Have tried to remove Sophos using Add/Remove Programs, but get a "Fatal error during installation" when I try to remove it. Before that I get the following:
Error 3005. Sophos Anti-Virus can only be uninstalled by users that are members of the Sophos Admnistrator user group.

Weird thing is that I am the administrator on this computer...this did used to be a work computer, probably has something to do with it.
Can I just delete from program files without using uninstall? I couldn't find an uninstall.exe anywhere in the program files.

Registry cleaners are extremely powerful applications that can damage the registry by using aggressive cleaning routines and cause your computer to become unbootable.

The Windows registry is a central repository (database) for storing configuration data, user settings and machine-dependent settings, and options for the operating system. It contains information and settings for all hardware, software, users, and preferences. Whenever a user makes changes to settings, file associations, system policies, or installed software, the changes are reflected and stored in this repository. The registry is a crucial component because it is where Windows "remembers" all this information, how it works together, how Windows boots the system and what files it uses when it does. The registry is also a vulnerable subsystem, in that relatively small changes done incorrectly can render the system inoperable. For a more detailed explanation, read Understanding The Registry.

Not all registry cleaners are created equal. There are a number of them available but they do not all work entirely the same way. Each vendor uses different criteria as to what constitutes a "bad entry". One cleaner may find entries on your system that will not cause problems when removed, another may not find the same entries, and still another may want to remove entries required for a program to work.

Not all registry cleaners create a backup of the registry before making changes. If the changes prevent the system from booting up, then there is no backup available to restore it in order to regain functionality. A backup of the registry is essential BEFORE making any changes to the registry.

Improperly removing registry entries can hamper malware disinfection and make the removal process more difficult if your computer becomes infected. For example, removing malware related registry entries before the infection is properly identified can contribute to system instability and even make the malware undetectable to removal tools.

The usefulness of cleaning the registry is highly overrated and can be dangerous. In most cases, using a cleaner to remove obsolete, invalid, and erroneous entries does not affect system performance but it can result in "unpredictable results".

Unless you have a particular problem that requires a registry edit to correct it, I would suggest you leave the registry alone. Using registry cleaning tools unnecessarily or incorrectly could lead to disastrous effects on your operating system such as preventing it from ever starting again.For routine use, the benefits to your computer are negligible while the potential risks are great.

NetSvcs: 6to4 - File not found
NetSvcs: Ias - File not found
NetSvcs: Iprip - File not found
NetSvcs: NWCWorkstation - File not found
NetSvcs: Nwsapagent - File not found
NetSvcs: WmdmPmSp - File not found

Error - 12/17/2010 7:55:39 PM | Computer Name = LTO-EWENZ-9439 | Source = crypt32 | ID = 131083
Description = Failed extract of third-party root list from auto update cab at: <http://www.download.windowsupdate.com/msdownload/update/v3/static/trustedr/en/authrootstl.cab>
with error: A required certificate is not within its validity period when verifying
against the current system clock or the timestamp in the signed file.

Error - 12/17/2010 7:55:39 PM | Computer Name = LTO-EWENZ-9439 | Source = crypt32 | ID = 131083
Description = Failed extract of third-party root list from auto update cab at: <http://www.download.windowsupdate.com/msdownload/update/v3/static/trustedr/en/authrootstl.cab>
with error: A required certificate is not within its validity period when verifying
against the current system clock or the timestamp in the signed file.

Note 1: UNCHECK any pre-checked toolbar and/or software offered with the Java update. The pre-checked toolbars/software are not part of the Java update.

Note 2: The Java Quick Starter (JQS.exe) adds a service to improve the initial startup time of Java applets and applications. If you don't want to run another extra service, go to Start > Control Panel > Java > Advanced > Miscellaneous and uncheck the box for Java Quick Starter. Click OK and restart your computer.